| GC&CS | Government Code and Cipher School 
| Others |
| GCCS | Galloway Community Charter School - New Jersey
| Others |
| GCCS | Genessee Community Charter School
| Others |
| GCCS | Georgia Center for Cancer Statistics
| Others |
| GCCS | Geostationary Communication and Control Segment
| Others |
| GCCS | Gila Crossing Community School
| Others |
| GCCS | Gilboa-Conesville Central School
| Others |
| GCCS | Global Climate Change and Society
| Others |
| GCCS | Global Command and Control System
| Others |
| GCCS | Global Command and Control Systems
| Others |
| GCCS | Global Conference on Cyber Space
| Others |
| GCCS | Gloucester County Christian School
| Others |
| GCCS | Golden City Computer Service
| Others |
| GCCS | Government Chinese Character Set
| Others |
| GCCS | Government Code and Cypher School
| Others |
| GCCS | Government College of Commerce, Sargodha
| Others |
| GCCS | Gray-Controlled Current Source
| Others |
| GCCS | Great Corolla Club Semarang
| Others |
| GCCS | Greater Chattanooga Christian Services
| Others |
| GCCS | Greater Cincinnati Chinese School
| Others |
| GCCS | Greater Clark County Schools
| Others |
| GCCS | Grove City Christian School
| Others |
| GCCS | Gulf Coast Christian Schools, St. Petersburg, Florida
| Others |
| GCCS | Gulf Coast Computer Systems
| Others |